Yeah, right now my go to’s are 4K77 for SW, 4K83 for ROTJ, and Harmy for ESB since 4K80 isn’t done yet and the Grindhouse/Dreamastered 35mm version isn’t the best looking to me.
Even if you’re sticking with 1080p, the 4K77/4K83 releases are excellent. Though I’d probably wait for 4K77 SkyMaster Edition for 1080p SW, and the forthcoming Sanjuro-graded DNR 4K83 for ROTJ.
For 4K, get the no-DNR Sanjuro graded ones if you can (though be prepared for SW to be grainier than you remember).